UP Rera has warned developers not to hand over incomplete flats, to homebuyers, and violating this rule could attract large sums of penalties.The notice, issued on May 8, came in response to complaints from homebuyers, who allege that developers are forcing them to take possession of bare-shell units – which are often devoid of proper flooring, electrical fittings, plumbing and kitchen furnishings – while signing the builder-buyer agreements (BBA).